class B {
  int n;
   static int sum=0;
   void setN(int n) {
     this.n=n;
   }
   int getSum() {
     for(int i=1;i<=n;i++)
       sum=sum+i;
     return sum;
   }
}
public class A4_3 {
  public static void main(String args[]) {
    B b1=new B(),b2=new B();
    b1.setN(3);
    b2.setN(5);
    int s1=b1.getSum();
    int s2=b2.getSum();
    System.out.println(s1+s2);
  }
}
